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2015-12-0001

PT0280-8

12/11/15

30

PT7C43390/43390C

Real-time Clock Module

d. Data access

 Real-time data 1 access

*1. Set NO_ACK = 1 when reading.

*2. Transmit ACK = 0 from the master device to the RTC when reading.

Real-Time Data 1 Access

 Real-time data 2 access

*1. Set NO_ACK = 1 when reading.

*2. Transmit ACK = 0 from the master device to the RTC when reading.

Real-Time Data 2 Access

 Status register 1 access and status register 2 access

*1. 0: Status register 1 selected, 1: Status register 2 selected

*2. Set NO_ACK = 1 when reading.

Status Register 1 Access and Status Register 2 Access

 INT1 register access and INT2 register access

In reading / writing the INT1 and INT2 registers, data varies depending on the setting of the status register 2. Be sure to read /

write after setting the status register 2. When setting the alarm by using the status register 2, these registers work as 3-byte alarm

time data registers, in other statuses, they work as 1-byte registers. When outputting the user-set frequency, they are the data

registers to set up the frequency. Regarding details of each data refer to "INT1 register and INT2 register" in "Configuration of

Registers".